using System.Text;
using System.Security.Cryptography;
using System.Text.Json;
namespace GalaGames
{
public class GalaGameAPI
{
private Uri baseAddress;
private string gameId;
private HMACSHA256 hmac;
private SHA256 sha256;
private HttpClient client = new HttpClient();
private string host;
public GalaGameAPI(string _url, string _gameId, string _hmacSecret)
{
baseAddress = new Uri(_url);
host = baseAddress.Host.Trim();
gameId = _gameId;
hmac = new HMACSHA256(Encoding.UTF8.GetBytes(_hmacSecret));
sha256 = SHA256.Create();
client.Timeout = TimeSpan.FromSeconds(1000);
}
public async Task<HttpResponseMessage> GetUserProfile(string userId)
{
HttpResponseMessage response = await GetAsync($"/api/v1/users/{userId}").ConfigureAwait(false);
return response;
}
// This is NOT sorted by collection, but rather gives you EVERYTHING back.
public async Task<HttpResponseMessage> GetUserItemsV1Now(string userId)
{
HttpResponseMessage response = await GetAsync($"/api/v1/item/{userId}").ConfigureAwait(false);
return response;
}
// This is limited to only your game's NFTs
public async Task<HttpResponseMessage> GetUserItemsV2Now(string userId)
{
HttpResponseMessage response = await GetAsync($"/api/v2/items/{userId}").ConfigureAwait(false);
return response;
}
// This is limited to only your game's NFTs
public async Task<HttpResponseMessage> GetUserItemsV3Now(string userId)
{
HttpResponseMessage response = await GetAsync($"/api/v3/items/{userId}").ConfigureAwait(false);
return response;
}
public async Task<HttpResponseMessage> PostAwardingGamePoints(string id, string token, int amount)
{
var payload = new
{
userId = id,
gameToken = token,
quantity = amount
};
HttpResponseMessage response = await PostAsync("/api/v2/game-points", JsonSerializer.Serialize(
payload
));
return response;
}
// Contact the Gala Game API with a request.
private async Task<HttpResponseMessage> GetAsync(string path)
{
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, new Uri(baseAddress, path));
// Date and indicate headers included in signature
request.Headers.Add("x-auth-signedheaders", "date;host");
request.Headers.Date = DateTime.UtcNow;
// Format headers for inclusion in signature
string date = new List<string>(request.Headers.GetValues("Date"))[0].Trim();
// This is the hash of the request body (which is always "")
string bodyHash = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
// Format entire request in string format for signing
StringBuilder crb = new StringBuilder(300);
crb.AppendLine("GET");
crb.AppendLine(path);
crb.AppendLine();
crb.Append("date:");
crb.AppendLine(date);
crb.Append("host:");
crb.AppendLine(host);
crb.AppendLine();
crb.AppendLine("date;host");
crb.Append(bodyHash);
string canonicalRequest = crb.ToString().Replace("\r", "");
// Calculate signature using our secret key
string signature = ToHex(hmac.ComputeHash(Encoding.UTF8.GetBytes(canonicalRequest)));
// Attach signature to request
request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("HMAC", $"{gameId}:{signature}");
HttpResponseMessage response = await client.SendAsync(request).ConfigureAwait(false);
return response;
}
// Contact the Gala Game API with a request.
private async Task<HttpResponseMessage> PostAsync(string path, string body)
{
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, new Uri(baseAddress, path));
// Date and indicate headers included in signature
request.Headers.Add("x-auth-signedheaders", "content-type;date;host");
request.Headers.Date = DateTime.UtcNow;
request.Content = new StringContent(body, Encoding.UTF8, "application/json");
// Format headers for inclusion in signature
string date = new List<string>(request.Headers.GetValues("Date"))[0].Trim();
// Hash the body of the request
byte[] bodyBytes = request.Content.ReadAsByteArrayAsync().GetAwaiter().GetResult();
byte[] bodyHash = sha256.ComputeHash(bodyBytes);
// Format entire request in string format for signing
StringBuilder crb = new StringBuilder(300);
crb.AppendLine("POST");
crb.AppendLine(path);
crb.AppendLine();
crb.AppendLine("content-type:application/json; charset=utf-8");
crb.Append("date:");
crb.AppendLine(date);
crb.Append("host:");
crb.AppendLine(host);
crb.AppendLine();
crb.AppendLine("content-type;date;host");
crb.Append(ToHex(bodyHash));
string canonicalRequest = crb.ToString().Replace("\r", "");
// Calculate signature using our secret key
string signature = ToHex(hmac.ComputeHash(Encoding.UTF8.GetBytes(canonicalRequest)));
// Attach signature to request
request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("HMAC", $"{gameId}:{signature}");
HttpResponseMessage response = await client.SendAsync(request).ConfigureAwait(false);
return response;
}
// Table-driven byte[] to lowercase hex
static private string[] sHexTable = { "00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f", "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f", "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f", "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af", "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf", "c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf", "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df", "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef", "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff" };
private string ToHex(byte[] data)
{
StringBuilder sb = new StringBuilder(data.Length * 2);
foreach (byte b in data)
sb.Append(sHexTable[b]);
return sb.ToString();
}
}
class Program
{
static async Task Test()
{
// Stage URI: https://game-server-api-stage0.gala.games/
// Production URI: https://game-server-api.gala.games/
var api = new GalaGameAPI("stge_or_prod_uri", "your_game_id", "your_key");
try
{
Console.WriteLine(await api.GetUserItemsV3Now("user_id_here"));
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
static void Main(string[] args)
{
Test().Wait();
}
}
}